2013

Rungta R1 By Neeraj Kumar Thakur

[EXPERIMENT 2 QSE LAB] Estimated cost of a proposed building from materials and labour by CBRI method .

EXPERIMENT NO - 2

TITLE –

Estimated cost of a proposed Single storey building of plinth area = 150 m2 from materials

and labour by CBRI method .

THEORY –

By this method approximate estimates are prepared for prototype structures or units

consisting of several works after comparing with past records of expenses for such works.

Such estimate can be prepared quickly even during meetings. But expert knowledge is

necessary to estimate the present cost of construction as compared to the previous recorded

cost.

a) Cost from materials and labour:- Emperical equations developed by Central Building

Research Institute (CBRI) Roorkee are used in estimating approximate quantities of

materials and labour by taking plinth area as input.

PROCEDURE

1) We have found out the quantities of each material and labour by inputing plinth area

given i.e 150 m2 in the equation given by CBRI for single storey building.

2) We multiplied the quantities of each materials and labour by their unit rate given and

found out amount of each material (Cost A) and labour (Cost B).

3) Summation of amount of material and labour is done to find out total construction

cost of single storey building (Cost A + Cost B)

OBSERVATION AND CALCULATIONS

a) Plinth Area = 150 m2

(Given)

b) Unit Rates = From Schedule of rates or (Given)

c) Materials=

d) Labour

Total Construction cost = A + B

i.e. Rs 470665.45 + Rs 235650

Total Construction cost = Rs 706315

RESULT –

The Estimation of proposed single storey building of plinth Area 150 m2

is found out to be Rs

706315 ( Rupees Seven Lacs Six thousand Three Hundred Fifteen ) using CBRI Method.

S.No. Material Single Storey unit plinth area Quantity AMOUNT

1 Bricks 2.26 A + 66.8 nos 150 405.8 nos 2.00Rs. nos 811.60Rs.

2 Cement 0.153 A+ 0.57 ton 150 23.52 ton 7,000.00Rs. ton 1,64,640.00Rs.

3 Steel 21.3 A -314 kg 150 2881 kg 83.00Rs. kg 2,39,123.00Rs.

4 Sand 0.47 A -7 cu m 150 63.5 cu m 150.00Rs. cu m 9,525.00Rs.

Coarse Aggregate -Rs.

5 20 mm and down (cu m) 0.176 A -0.21 cu m 150 26.19 cu m 340.00Rs. cu m 8,904.60Rs.

6 40 mm and down (cu m) 0.145 A + 1.5 cu m 150 23.25 cu m 310.00Rs. cu m 7,207.50Rs.

7 Brick Aggregate (cu m) 0.113 A - 0.83 cu m 150 16.12 cu m 225.00Rs. cu m 3,627.00Rs.

8 Lime (quintal) 0.145 A - 0.35 quintal 150 21.4 quintal 440.00Rs. quintal 9,416.00Rs.

9 Surkhi (cu m) 0.052 A - 0.37 cu m 150 7.43 cu m 185.00Rs. cu m 1,374.55Rs.

10

Timber frames and Shutters

(cu m) 0.019 A + 0.23 cu m 150 3.08 cu m 8,000.00Rs. cu m 24,640.00Rs.

11 Primer (Lt) 0.068 A lt 150 10.2 lt 40.00Rs. lt 408.00Rs.

12 Paint (Lt) 0.108 A + 0.27 lt 150 16.47 lt 60.00Rs. lt 988.20Rs.

Sub Total (A) 4,70,665.45Rs.

Rate per unit

1 Mason 1.335 A + 28 days 150 228.25 days 350.00Rs. day 79,887.50Rs.

2 Carpenter 1.184 A -9 days 150 168.6 days 200.00Rs. day 33,720.00Rs.

3 painter 0.089 A days 150 13.35 days 200.00Rs. day 2,670.00Rs.

4 Blacksmith 0.269A -4 days 150 36.35 days 200.00Rs. day 7,270.00Rs.

5 Mazdoor 4.769A + 32 days 150 747.35 days 150.00Rs. day 1,12,102.50Rs.

Sub Total (B) 2,35,650.00Rs.

VIVA QUESTIONS –

1. What is CBRI Method ?

2. Full form of CBRI ?

3. How these emperical equation have been been derived ?